[DO NOT LAND] Set @@toStringTag for DOM object prototypes

Source/bindings/tests/results/modules/V8TestInterface5.cpp

Index: Source/bindings/tests/results/modules/V8TestInterface5.cpp
diff --git a/Source/bindings/tests/results/modules/V8TestInterface5.cpp b/Source/bindings/tests/results/modules/V8TestInterface5.cpp
index 877e81a67b6b5866d3b39b6cd6af2b18c0dfb5e9..62703dc10bb87957ce050338ef552436d156aa78 100644
--- a/Source/bindings/tests/results/modules/V8TestInterface5.cpp
+++ b/Source/bindings/tests/results/modules/V8TestInterface5.cpp
@@ -991,6 +991,8 @@ static void installV8TestInterface5Template(v8::Local<v8::FunctionTemplate> func
     V8DOMConfiguration::installMethod(isolate, prototypeTemplate, defaultSignature, static_cast<v8::PropertyAttribute>(v8::DontDelete | v8::DontEnum), toStringMethodConfiguration);
     functionTemplate->SetNativeDataProperty(v8AtomicString(isolate, "staticStringAttribute"), TestInterface5ImplementationV8Internal::staticStringAttributeAttributeGetterCallback, TestInterface5ImplementationV8Internal::staticStringAttributeAttributeSetterCallback, v8::External::New(isolate, 0), static_cast<v8::PropertyAttribute>(v8::None), v8::Local<v8::AccessorSignature>(), static_cast<v8::AccessControl>(v8::DEFAULT));
 
+    prototypeTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestInterface5"));
+
     // Custom toString template
     functionTemplate->Set(v8AtomicString(isolate, "toString"), V8PerIsolateData::from(isolate)->toStringTemplate());
 }